1 files changed, 2 insertions, 0 deletions
diff --git a/gpio/pin.h b/gpio/pin.h
index aede480..c85de7f 100644
--- a/gpio/pin.h
+++ b/gpio/pin.h
@@ -86,7 +86,9 @@ class Pin {
 		}
 		
 		void set_speed(Speed s) {
+			#if defined(STM32F4)
 			g.OSPEEDR = (g.OSPEEDR & ~(3 << (n * 2))) | s << (n * 2);
+			#endif
 		}
 		
 		void on() {